Memorias de investigación
Artículos en revistas:
Mitochondrial DNA reveals hidden diversity for tardigrades from across the Antarctic realm.
Año:2015
Áreas de investigación
  • Ciencias naturales y ciencias de la salud
Datos
Descripción
Antarctica contains some of the most challenging environmental conditions on the planet due to freezing temperatures, prolonged winters and lack of liquid water. Whereas 99.7% of Antarctica is permanently covered by ice and snow, some coastal areas and mountain ridges have remained ice-free and are able to sustain populations of microinvertebrates. Tardigrades are one of the more dominant groups of microfauna in soil and limno-terrestrial habitats, but little is known of their diversity and distribution across Antarctica. Here, we examine tardigrades sampled from across an extensive region of continental Antarctica, and analyse and compare their partial mitochondrial cytochrome c oxidase subunit 1 (COI) gene sequences with those from the Antarctic Peninsula, maritime and sub-Antarctica, Tierra del Fuego and other worldwide locations in order to recognise operational taxonomic units (OTUs). From 439 new tardigrade COI sequences, we identified 98 unique haplotypes (85 from Antarctica) belonging to Acutuncus, Diphascon, Echiniscus, Macrobiotus, Milnesium and unidentified Parachela. Operational taxonomic units were delimited by Poisson tree processes and general mixed Yule coalescent methods, resulting in 58 and 55 putative species, respectively. Most tardigrades appear to be locally endemic (i.e. restricted to a single geographic region), but some (e.g. Acutuncus antarcticus (Richters, 1904)) are widespread across continental Antarctica. Our molecular results reveal: (i) greater diversity than has previously been appreciated with distinct OTUs that potentially represent undescribed species, and (ii) a lack of connectivity between most OTUs from continental Antarctica and those from other Antarctic geographical zones.
Internacional
Si
JCR del ISI
Si
Título de la revista
Invertebr Syst
ISSN
1445-5226
Factor de impacto JCR
2,264
Información de impacto
Volumen
29(6)
DOI
10.1071/IS14019
Número de revista
Desde la página
578
Hasta la página
590
Mes
SIN MES
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Participantes
  • Autor: Alejandro Velasco-Castrillón
  • Autor: Sandra J. Mcinnnes
  • Autor: Mark B Schultz
  • Autor: María Arróniz Crespo UPM
Grupos de investigación, Departamentos, Centros e Institutos de I+D+i relacionados
  • Creador: Grupo de Investigación: Contaminación de agroecosistemas por las prácticas agrícolas
  • Departamento: Química y Tecnología de Alimentos